RFR: Avoid considering fixVersions that are not valid releases when calculating the hgupdate-sync label [v2]

[Robin Westberg]

> There may be backport records that have fixVersions that should be ignored when calculating which of them should receive the hgupdate-sync label.

Robin Westberg has updated the pull request incrementally with one additional commit since the last revision:

  Fix compile issue

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Changes:
  - all: https://git.openjdk.java.net/skara/pull/1010/files
  - new: https://git.openjdk.java.net/skara/pull/1010/files/3e5957ac..3dc9a7e2

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=skara&pr=1010&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=skara&pr=1010&range=00-01

  Stats: 4 lines in 2 files changed: 0 ins; 2 del; 2 mod
  Patch: https://git.openjdk.java.net/skara/pull/1010.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/1010/head:pull/1010

PR: https://git.openjdk.java.net/skara/pull/1010